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New York City's Twenty-five Foot Map, Scholarship for Belgian Students in American Universities and more

Includes editorials on
Blockade by Submarine
The War of Attrition (Naval)

By Charles W. Person

The Panama-Pacific International Exposition at Night

How the Illuminating Engineer Uses Light Decoratively

By Hamilton M. Wright

Valuable Products Recovered from Coke Oven Gases

The Enormous By-product Coke Plant at Gary, Indiana

The Death of Cecil Peoli, Prof. C. W. MacCord Dead and more

Longitudes by Wireless Telegraphy

By F. B. Littell

A New Searchlight for the United States Navy

By Herbert T. Wade

Saving Eight Million Tons of Coal a Year

A Hydro-Electric Development That Uses a Head of 4,000 Feet

The Sound Wheel, a Novel Wireless Detector, The Albessard Aeroplane and more

By the Berlin Correspondent of the Scientific American

Animal Life in a Zoo

The Modern Way of Keeping Wild Animals

By Alexander Pope

A Clock Built of Straw, Vacuum System of Gasoline Feed and more

Continuous Aviation Competitions, The Current Supplement


  • Departments

    Correspondence - April 24, 1915

  • Recently Patented Inventions - April 24, 1915

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April 24, 1915

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